I say get on with it as long as you're either carrying enough food and water to keep you going, or know or resupply points. Coast path running at night is no more dangerous than any other type - and for me, better as long as I keep the sea on my left/right I'm on the right route! You'll probably find there are pubs / churches / WCs with outside taps en-route, but don't count on it... I often find myself in someone's garden filling water bottles from outside taps
I did the Adventuehub Exmoor coastal ultra route, (44 miles/9,000') last weekend solo, really enjoyed it - not being in a race takes the pressure off a bit and allows you to enjoy the day!
Well, not sure how everyone else found that - but I found it a long, tough old day... Over an hour slower than last year, managed to get lost a couple of times and just found the relentless mud really energy-sapping.
still, a great event - good checkpoints, though I think an extra one to break up the big distances to CP3 and CP4 would be a good idea.